TELCODOCS-2706 DITA rewrite for update-before-the-update.adoc

[rohennes]

Summary

• Fix Vale AsciiDocDITA rule violations in update-before-the-update.adoc
• Automated DITA rewrite workflow

JIRA

https://issues.redhat.com/browse/TELCODOCS-2706

Test plan

• Verify Vale errors are resolved
• Review content changes for accuracy
• Build documentation locally

🤖 Generated with Claude Code

[ocpdocs-previewbot]

🤖 Fri Feb 13 11:56:23 - Prow CI generated the docs preview:

https://106567--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/control_plane_backup_and_restore/backing-up-etcd.html
https://106567--ocpdocs-pr.netlify.app/openshift-enterprise/latest/etcd/etcd-backup-restore/etcd-backup.html
https://106567--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/cluster-tasks.html
https://106567--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/updating/update-before-the-update.html

[openshift-ci]

@rohennes: all tests passed!

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